I build production web applications and deliver end-to-end product features — from problem framing to release and iteration.

I work at the intersection of engineering + product: translate business goals into reliable UX, ship iteratively, measure impact, and keep systems maintainable at scale.

• 🌍 Cherkasy, Ukraine
• ✉️ kononyukii@gmail.com
• 🔗 LinkedIn: https://www.linkedin.com/in/ivan-kononyuk-1924201b4/

• Ownership from discovery → delivery → iteration
• Strong execution: small PRs, predictable releases, fast feedback loops
• UX quality: accessibility, performance, edge cases, resilience
• Cross-team collaboration: product/design/backend/stakeholders
• Pragmatic architecture: scalable patterns without over-engineering

I use AI tools in daily engineering work to increase delivery speed without sacrificing quality:

• Faster iteration on implementation details (while keeping architecture stable)
• Higher-quality refactoring and safer changes via tests + small PRs
• Better documentation/ADR discipline and clearer PR communication
• Consistent patterns and reduced cognitive load on repetitive tasks

Frontend

• React, Next.js (App Router), TypeScript (strict)
• TanStack Query / Router, Zustand
• GraphQL (BFF pattern), REST, WebSockets

Styling & UI

• Tailwind CSS + shadcn/ui (design-system driven)
• SCSS (modular architecture)
• styled-components (CSS-in-JS)

Quality & Delivery

• Vitest, Playwright
• GitHub Actions, CI discipline
• Performance profiling & optimization

An open-source, privacy-first web tool that turns patient pre-visit intake into a structured, clinician-friendly summary/PDF (no diagnosis / no treatment / no triage).

Stack: Next.js (App Router) · TypeScript (strict) · Tailwind · shadcn/ui · Zustand · TanStack Query · Zod · IndexedDB
Quality: Vitest · Playwright · CI: GitHub Actions
Repo: https://github.com/kononyukii/structured-intake-assistant

Focus: safe boundaries, structured data capture, privacy-by-default, output sanitization, export-ready summaries.

A local-first app focused on safe mental wellness routines (no medical claims / no diagnosis).

Stack: Next.js · TypeScript · Tailwind · shadcn/ui · Zustand · TanStack Query · Zod · IndexedDB
Testing: Vitest · Playwright · CI: GitHub Actions
Repo: https://github.com/kononyukii/mind-track

Focus: architecture, offline reliability, accessibility, performance, release discipline.

• Turning ambiguous product requirements into clear solutions
• Building reusable UI patterns and scalable feature architecture
• Improving DX and keeping codebase “easy to change”
• Shipping reliably under real constraints

Open to collaborating on interesting products (frontend-heavy or full product delivery).